Seasonal protection through voluntary programs.
D000041:Absenteeism; D003362:Cost-Benefit Analysis; D005260:Female; D006801:Humans; D007251:Influenza, Human / Q000517:prevention & control; D008297:Male; D009786:Occupational Health Services / Q000191:economics*; D011014:Pneumonia / Q000517:prevention & control; D012409:Rubella / Q000517:prevention & control; D014611:Vaccination / Q000191:economics*